I don't know how many other side hill shots you have on the course, but there is a tendency to miss in the direction of the slope. This isn't a problem for compound shooters who have a leveling bubble, because level is level, but a trad shooter may feel level when really he's not. You can try leaning into the hill a little or compensating by aiming to the left a little.
The other problem you might have is that if you are anticipating a problem, you might have more of a tendency to peek, which will mess up your shot, so focus on keeping your head down through follow through.